Corrugating apparatus



J. STANlTZ ET AL CORRUGATING APPARATUS July 25, 1933.

3 Sheets-Sheet4 2 Filed April 22, 1932 fff' Patented July 25, 1933 UNITED STATES PATENT OFFICE JACQUES STANITZ AND GEORGE BOYER, OF WARREN, OHIO, ASSIGNORS TO THE YOUNGSTOWN PRESSED STEEL COMPANY, OF WARREN, OHIO, A CORPORATION 0F OHIO CORBUGATING APPARATUS Application filed y,April 22,

This invention relates to improvements in corrugating apparatus and, more especially,.

such apparatus designed for producing corrugations, ribs or ridges in the side walls of relatively deep receptacles or containers, for example, cylindrical washing machine tubs made out of drawn sheet metal. Our invention may be employed in producing either straight or spiral corrugations, as hereinafter set forth.

Heretofore, considerable difficulty has been encountered in connection with the formation of corrugations in tubs of the kind referred to. Such apparatus has ordinarily employed a pair of dies, one being provided with projecting parts to form the corrugations. These projecting parts, being subjected to hard wear, have ordinarily had a short life or else have become deformed or roughened, causing improper operation. By the use of our invention, these objections are overcome.

It may bestated, in general, that the principal feature of our invention is the provision in one of the dies of rotatable members adapted to form the corrugations referred to. These rotatable members, for eX- ample, may be spherical, roller-shaped, or the like.

Other features and advantages of our invention will appear more fully as we proceed with out specification.

In those forms of devices embodying the features of our invention shown in the accompanying drawings--` Figure 1 is a View in slde elevation of a completed tub with vertical corrugations;

Fig. 2 is a View taken as indicated by the lline 2 of Fig. 3, showing the corrugating apparatus; Fig. 8 is a view taken as indicated by the line 3 of Fig. 2; Fig. 4 is a view taken as indicated by the line 4 of Fig. 2; Fig. 5 is a view taken as indicated by the line 5 of Fig. 4; Fig. 6 is a View similar to Fig. 1 showing spiral corrugations; Fig. 7 is a view taken as indicated by the line 7 of Fig. 8 showing the apparatus 'for forming spiral corrugations; Fig. S is a vertical sectional view of the apparatus for forming spiral corrugations; Fig. 9 is a view vtaken as indi- 1932. Serial N0. 606,971.

cated by the line 9 of Fig. S; Fig. 10 is a view similar to Fig. 4 showing a modified form; and Fig. 11 is a view similar to Fig. 5 showing the modification of Fig. 10.

As shown in the drawings, 10 indicates a cylindrical relatively deep container, for eX- ample, a wash tub after the same has been provided with the vertical corrugations 11 in its side wall. These corrugations provide raised vertical ridges or ribs on'the inner wall of the tub.A

The apparatus for forming the corrugations 11 comprise the male and female dies 14 and 15, respectively, which are axially relatively movable. As here shown, the upper part of the female die 15 is provided with a removable ring 15a held in position on the flange ring 15b by the machine screws 16.

The female die, indicated in general by 15, is provided with protruding balls 17 adapted to form the corrugations 11 in the tub 10 as the same is forced downwardly into the female die by the male die 14. The male die or punch 14 is provided with cooperating grooves 18 to accommodate the corrugations 11 as they are formed in the wall of the tub.

As here shown, the balls 17 rest on a supporting block 19 which may be in the form of a ring mounted between the members 15 and 151. This ring may be attached to the member 15a by the machine screws 20.

On top of the ring 19 is a spacing ring 21 with curved notches 22 embracing the balls 17 and spacing them properly.

In the modified form shown in Figs. 10 and 11, the rollers 117 are substituted for the balls 17. In other respects, the construction and operation are substantially the same as above shown, the rollers 117 resting on a supporting block or ring 119 cor- We have shown the invention embodied in apparatus for forming spiral grooves instead of straight ones. In this form, the tub is indicated by 210 and the spiral corrugations therein by 211. The male die is indicated by 214 and the female die, by 215. The construction and operation are substantially-'the same as in the making of vertical corrugations, except that the two dies, instead of being only axially relatively movable, must also be rotatably relatively movable. To accomplish this, the die 214 is rotatably supported on the vertically movable head 214a. The parts ofthe male die 214 and 214a are joined in the following manner. A plug 214b with a flange 214c is threaded into the portion 214. The part 2142t is provided with a flange 214d lying under the flange 214. A row of balls 214e is provided between the parts 214d and 214c and another row of balls 214f is provided between the parts 214-"l and 214. These balls lie in suitable grooves or raceways in the adjacent parts and permit the part 214 to rotate with respect to part 214, the balls lessening friction between the parts and furnishing thrust bearings for the downward movement of the part 214 and also for its withdrawal from the female die.

Rotation of the part 214 with respect to the carrier 2141 is limited by the pin 214g extending into an arcuate slot 214h in the member 2142*. A spiral spring 214 may be provided to yieldingly retard rotation of the part 214.

, 1n the form Vshown in Figs. 6, 7, 8 and 9, the member 214 is provided with spiral grooves 218 to accommodate the corrugations 211 as they are formed in the wall of the tub. These corrugations are formed by the protruding balls 217 in the female die which are supported in the same manner as the balls 17 above described. The balls 217 `follow the spiral grooves 21.8 in the male die) and form the corrugations 211 in the tu The balls 217 are supported in a manner similar to the balls 17 and such support need not be described in detail. It will suffice to say ythat the balls rest on a ring 219 similar to the ring 19 and are suitably spaced by a ring 221 similar to the ring 21.

While we have shown and described certain embodiments of our invention, it is to be understood that it is capable of many modifications. Changes, therefore, in the construction and arrangement may be made without departing from the spirit and scope of the invention as disclosed in thc appended claims, in which it is our intention to claim all novelty inherent in our invention as broadly as permissible, in View of the prior art.

What we regard as new, and desire to secure by Letters Patent, is:

1. Apparatus for fluting a closed-bottom sheet metal tub or the like, comprising a female die provided with a series of inwardly protruding rotatabltl spherical members; and a male die in the form of a plunger adapted to engage the bottom and side wall of a tub and thrust the same into the female die, said male die having a series of grooves adapted to register with the rotatable members in the female die and permit said members to roll portions of the side wall of said tub into the grooves.

2. Apparatus as specified in claim 1, in which the female die is of circular crosssection, the male die is anti-frictionally mounted for oscillation on an actuating ram, and said male die is provided with helical grooves adapted to oscillate said male die as it moves within the female die.

JACQUES STANITZ. GEORGE D. BOYER.

CERTIFICATE OF CORRECTION.

Ifatent No. l, 919, 869.

July 25, 1933.

JACQUES STANITZ, ET AL.

y It is hereby certified that error appears in the printed specification ol the above numbered patent requiring correction as follows: Page 2, line 91, claim l, strike out the word uspherical"; and that the said Letters Patent should he read with this correctiontherein that the same may contornato the record ol the case in the Patent Office.

Signed and sealed this 29th day ot August, A. D. 1933.

(Seal) l. Moore..

Acting Commissioner ol Patente. 

